lib/systems: remove broken kernel configurations

None of these successfully build a kernel, and as we’re moving
away from putting kernel configuration in the platform structure and
don’t package the vendor kernels that all but `fuloong2f_n32` expect,
there’s no point to keeping these kernel configurations in Nixpkgs.

lib/systems/platforms.nix

@@ -212,15 +212,6 @@ rec {
   };
 
   zero-gravitas = {
-    linux-kernel = {
-      name = "zero-gravitas";
-
-      baseConfig = "zero-gravitas_defconfig";
-      # Target verified by checking /boot on reMarkable 1 device
-      target = "zImage";
-      autoModules = false;
-      DTB = true;
-    };
     gcc = {
       fpu = "neon";
       cpu = "cortex-a9";
@@ -228,15 +219,6 @@ rec {
   };
 
   zero-sugar = {
-    linux-kernel = {
-      name = "zero-sugar";
-
-      baseConfig = "zero-sugar_defconfig";
-      DTB = true;
-      autoModules = false;
-      preferBuiltin = true;
-      target = "zImage";
-    };
     gcc = {
       cpu = "cortex-a7";
       fpu = "neon-vfpv4";
@@ -269,24 +251,6 @@ rec {
     };
   };
 
-  guruplug = lib.recursiveUpdate sheevaplug {
-    # Define `CONFIG_MACH_GURUPLUG' (see
-    # <http://kerneltrap.org/mailarchive/git-commits-head/2010/5/19/33618>)
-    # and other GuruPlug-specific things.  Requires the `guruplug-defconfig'
-    # patch.
-    linux-kernel.baseConfig = "guruplug_defconfig";
-  };
-
-  beaglebone = lib.recursiveUpdate armv7l-hf-multiplatform {
-    linux-kernel = {
-      name = "beaglebone";
-      baseConfig = "bb.org_defconfig";
-      autoModules = false;
-      extraConfig = ""; # TBD kernel config
-      target = "zImage";
-    };
-  };
-
   # https://developer.android.com/ndk/guides/abis#v7a
   armv7a-android = {
     linux-kernel.name = "armeabi-v7a";
@@ -370,74 +334,6 @@ rec {
   };
 
   fuloong2f_n32 = {
-    linux-kernel = {
-      name = "fuloong2f_n32";
-      baseConfig = "lemote2f_defconfig";
-      autoModules = false;
-      extraConfig = ''
-        MIGRATION n
-        COMPACTION n
-
-        # nixos mounts some cgroup
-        CGROUPS y
-
-        BLK_DEV_RAM y
-        BLK_DEV_INITRD y
-        BLK_DEV_CRYPTOLOOP m
-        BLK_DEV_DM m
-        DM_CRYPT m
-        MD y
-        EXT4_FS m
-        USB_STORAGE_CYPRESS_ATACB m
-
-        IP_PNP y
-        IP_PNP_DHCP y
-        IP_PNP_BOOTP y
-        NFS_FS y
-        ROOT_NFS y
-        TUN m
-        NFS_V4 y
-        NFS_V4_1 y
-        NFS_FSCACHE y
-        NFSD m
-        NFSD_V2_ACL y
-        NFSD_V3 y
-        NFSD_V3_ACL y
-        NFSD_V4 y
-
-        # Fail to build
-        DRM n
-        SCSI_ADVANSYS n
-        USB_ISP1362_HCD n
-        SND_SOC n
-        SND_ALI5451 n
-        FB_SAVAGE n
-        SCSI_NSP32 n
-        ATA_SFF n
-        SUNGEM n
-        IRDA n
-        ATM_HE n
-        SCSI_ACARD n
-        BLK_DEV_CMD640_ENHANCED n
-
-        FUSE_FS m
-
-        # Needed for udev >= 150
-        SYSFS_DEPRECATED_V2 n
-
-        VGA_CONSOLE n
-        VT_HW_CONSOLE_BINDING y
-        SERIAL_8250_CONSOLE y
-        FRAMEBUFFER_CONSOLE y
-        EXT2_FS y
-        EXT3_FS y
-        MAGIC_SYSRQ y
-
-        # The kernel doesn't boot at all, with FTRACE
-        FTRACE n
-      '';
-      target = "vmlinux";
-    };
     gcc = {
       arch = "loongson2f";
       float = "hard";